Screen



Patented Mar. 28, |899. C. W. PICKETT.

SCREEN.

(Application med Fefb. 1s, 199s.)v

(No Model.)

2 Sheets-Sheet I.

No. 622,070. Patented Mar. 28, |899.

C. W. PICKETT. scm-:en

(Application led Feb. 18, 1898.)

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STATES PATENT Futon.

SCREEN.

SPECIFICATION forming part of Letters Fatent N o. 622,070, dated March 28, 1899. Application filed February 18, 1898I Serial No. 670,828. (No model.)

T0 a/ H wir/0m t may concern:

Be it known that I, CHARLES W. PICKETT, a)a citizen of the United States, residing at Watertown, in the county of Jefferson and State of New York, have invented certain new and useful Improvements in Screens; and I do herebydeclare the following to bea full,clear, and exact description ofthe invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to a novel screening apparatus designed particularly for the screening of ground wood-pulp,-suliite pulp, and paper or other fiber in a Wet condition.

The object of the invention is to produce a simple and efficient apparatus of the character described which will produce a successive blast and suction immediately below one or more screen-plates upon Which the pulp or fiber is deposited in order to loosen the same by the alternate blast and suction, to cause the pulp and water in a finely-divided condition to pass through the screen, and to prevent clogging of the screen by the coarse particles, which wo uld result from the suction if it were not for t-he alternation therewith of the blast.

To the accomplishment of these and other objects subordinate thereto the invention consists,essentially, in the employment of one or more screen-plates mounted above one or more diaphragms, which are vibrated to produce the blast and suction by means of novel vibrating mechanism, all of which 'Will be hereinafter fully described, and succinctly pointed out in the appended claims.

Referring to the drawings, Figure 1 is a side elevation of my device complete. Fig. 2 is a top plan view thereof. Fig. 3 is a transverse section on the line 3 3 of Fig. 2. Fig.` 4 is a similar view on the line 4 4 of Fig. 2. Fig. 5 is a central longitudinal section through the upper portion of my apparatus on the line 5 5 of Fig. 2, and Fig. 6 is a View of the rear side of the screen-box.

Referring to the numerals on the drawings, l indicates what may be termed the screenbox, consisting of the bottom 2, provided with a longitudinal opening 3, subdivided into the desired number of compartments 4 by transverse partitions 5, which extend upwardly from the under surface of the bottom a considerable distance into the box.

6 indicates an oblong frame located upon the bottom and surrounding the opening, a space of several inches being left between the frame 6 and the Walls of the screen-box, and said-frame, which I shall designate the diaphragm-frame, being flush with the upper edges of the several partitions.

7 and 8 indicate the front and rear sides of the screen-box, the former being provided with an elongated opening 9, adjacent to its lower edge, and the latter with a series of openings l0, designed to be protected by hinged cover-plates l1, provided with terminal hooks 12, engaging pins 13.

14 and lindicate the ends of the boX,which are preferably formed integral with standards 16, having their lower ends connected by a pair of parallel brace-rods 17.

18 18 indicate a series of diaphragms of any suitable sensitive material, stretched over each of the compartments of the diaphragmframe and secured to said frame and to the partitions 5.

19 indicates what may be termed the screen-frame, fitting within the screen-box above the diaphragm-frame and composed of an oblong frame subdivided by transverse partit-ions 20, preferably located above the partitions 4. Screen-plates 21 of any desired character are secured, as by bolt-screws or the like, upon the screen-frame directly above each of the diaphragms carried by the diaphragm-frame, and. the side pieces of the screen-frame are recessed on their under sides to permit the debris which passes through the screens to the diaphragms to be discharged from the screen-box through the longitudinal opening in its front Wall or through the several openings in its rear Wall.

The screen-frame is provided adjacent to its rear side with trunnions 22, which are received in bearing-notches 23 in the box, and the frame is held in place by adam 24, which lies against the inner face of the rear side of the box and between it and the hinged side of the screen-frame, a securing-strip 25 bein g secured to the face of the dam-plate and resting upon the edge of the screen-plate in order to retain the latter firmly in position, but to IOO permit of its being elevated when the damplate is removed for the purpose of permitting access tothe d iaphragms. The pi imary purpose of this dam-plate, however, is to control the discharge from the diaphragms through the rear side of the screen-box, as this discharge will not take place ordinarily except when the device is washed out, at which times the cover-plates 1I are thrown back and the dam-plate is slightly elevated in order to permit the water to liow freely through the screenbox. lf desired, a screening-box 26 may be attached to the front side of the screen-box to receive the screenings as they pass from the diaphragm th rough the longitudinal opening in the front side.

As has been premised, one of the essential features of the invention is the inducement of a successive blast andsuction through the screens from below, and this Iaccomplish by vibrating the diaphragms, which, being located directly below the screens, will effect the desired result. Any suitable mechanism for vibrating the diaphragms may be provided; but I shall now proceed to a description of the mechanism which I at this time deem preferable for this purpose, and I shall define this mechanism in the appended claims as means for introducing a successive blast andsnetion andas diaphragm-vibrating mechanism. In the drawings I have only illustrated vibrating mechanism in connection with three of the diaphragms, two of which are identical and the third of which is employed to give the diaphragm a peculiar rocking or undulating movement as distinguished from the vertical vibration which is imparted to the other two. Referring to the latter, 27 and 2S indicate a pair of flat plates imposed against the under faces ofthe diaphragms and supported upon depending standards 29, provided at their centers with rearwardly-curved portions or yokes 30 and terminating at their lower ends in screw-threaded rods 3l, extending downwardly into spiral springs 32, seated upon cross-bars 33 and bearing at their upper ends against spring-caps 34, adjustably mounted upon the threaded rods and designed to be secured in their adjusted positions by clamping-nuts 35. Each of the standardsis provided upon one side, immediately below the yoke, with a horizontal flange 3G, upon which is seated au adjustable block 37, designed to be adjustable vertically by means of adj ustment-serews 33 and to be fixed in its adjusted position by a set-screw 39, passing through the block and into the standard.

40 and 4l indicate a pair of wheels mounted upon a horizontal shaft 42 and provided with ratchet-teeth designed to contact with the block 37 and to impart a rapid reciprocatory movement to the standards. It will be observed that as these wheels rotate the Hat sides of the teeth will act upon the blocks and will force the standards downwardly against the resistance of the springs with a comparatively gradual movement; but as soon as the tooth has passed the block the spring will throw the standard upwardly with a quick movement. This reciprocation of the standards in opposite directions at different speeds will canse the plates imposed against the under sides of the diaphragms to impart a pcculiar vibration to said diaphragms, which will induce a blast when the standards are quickly elevated and will induce a suction when they are gradually depressed. The effect of this operation upon the pulp or fiber upon the screen-plates will be obvious, as it will be seen that the blast will tend to loosen the same and that the suction will draw the pulp and water in a finely-divided condition through the screen and will canse them to be deposited upon the diaphragms, which by reason of their constant vibration will deposit such pulp in the screening-box 2G. It is obvious, however, that instead of the wheels provided with ratchet-teeth various forms of cam-wheels might be employed for the purpose of varying the movement of the diaphragms to suit the contingencies of use.

If desired, the ratchet-wheels 40 and 4].,with their connected parts, may be inelosed in a suitable casing supporting an oil-cup, whereby the parts maybe run in oil or may he protected from dust and debris and oiled by means of the drip from the cup.

The shaft 42 extends longitudinally at the center of the device and about midway bctween the screen-box and the support and is journaled in suitable bearings carried by the frame and is provided at one en d with a crank 43, by means of which the shaft may be rotated to actuate the diaphragm-vibrating mechanism described.

In addition tothe reciprocatory diaphragmvibrating mechanism which I have just dcscribed I have illustrated another form of vibrating mechanism designed to impart an undulatory movement to the diaphragm or, in other words, to cause a simultaneous elevation and depression of the opposite ends of the diaphragm, which produces in effect a blast adjacent to one side of the screen-plate and a suction at the opposite side, this peculiar alternation of the blast and suction at opposite sides of the plate serving not only to loosen the pulp or fiber and to draw the fine particles thereof through the screen, but to cause the fiber upon the screen to be given a lateral vibration, which serves to even more effectually detach the screenings and to cause their gravitation to the diaphragm. This mechanism consists of a plate 44, imposed against the under side of one of the diaphragms and mounted upon a shaft located at its center to permit the plate to rock. This motion is imparted by means of an oslcillatory arm depending from the plate at its center and provided with a fork 45 at its lower end spanning a cam 4G, keyed or otherwise secured upon the shaft 42. It lwill now be ICO IIO

seen that when the power-shaft is rotatedas, for instance, through the medium of the crank or by the application of any suitable power-transm itter-the vibrating mechanism just referred to will cause the peculiar vibration described of the diaphragms and will oscillate the arm to rock the plate, and thereby impart an undulatory vibration to the diaphragm in operative relation therewith. In order to Vary the vibration of this last-named diaphragm, I mounta series of cams or eccentrics 47 uponthe shaft, as by means of a spline, said cams or eceentrics being capable of longitudinal movement upon the shaft, so that any one of them may be brought into operative relation with the fork upon the lower end of the arm before referred-to. It will thus be observed that when the pulp or iber has been deposited upon the screen-plates and the power shaft is rotated the several diaphragms will b e vibrated to cause a successive, blast and suction to be induced through the screenplates, which will quickly effect the loosening of the pulp or iiber and will cause the thin particles thereof to be separated and drawn below the screen, the vibration of the diaphragm serving, in addition to the function referred to, to cause the screenings to be discharged into a suitable receptacle provided for them; but while the present embodiment of my invention appears to be preferable I do not desire to limit myself tothe structural details set out, but reserve the right to change, modify, or vary them at will within the scope of the protection prayed.

Having thus described my invention, what I claim as new, and desire to secu re by Letters Patent, is-

1. The combination with a screen, of a diaphragm located therebelow, a standard in operative relation with the diaphragm, a spring designed to cushion the movement of the standard and to retain it in its elevated position, an adjustable block carried by the standard and a cam-wheel in operative relation with the block and designed to actuate the standard in opposition to the spring, substantially as specified.

2. The combination with a screen, of a diaphragm located therebelow, a plate imposed 4. The combination with a stationary screen,

of an imperforate iiexible diaphragm located therebelow and secured along its edges, and means for imparting opposed vibrations to the opposite ends of the diaphragm, substantially as specified.

5. The combination with a stationary screen, of aflexible diaphragm secured along its edges, and a rocking plate imposed against the .under surface of the diaphragm, substantially as specified.

6. The combination with a stationary screen and a flexible diaphragm secured along its edges, of a rocking plate imposed against the under surface of the diaphragm, and an oscillatory arm designed to impart motion to the plate, substantially as specified.

7. The combination with a screen and diaphragm, of a rocking plate imposed against the under surface of the diaphragm, a vibratory arm extending from said plate and a series of cam-wheels adj ustably mounted in order to permit either of said cams to be brought into operative relation with the arm, substantially as specified. Y

8.- The combination with a screen-box, of a diaphragm-frame located within the box, and of sufciently smaller dimensions to leave a space surrounding the diaphragm-frame, a' hinged screen-frame above the diaphragmframe, and provided with screens, a damplate located against the inner face of one side of the screen-box, and designed to control the openings therein, and a screening-box secured to the screen-box, and designed to receive the screenings discharged from the screen-box through an opening in its front side, substantially as specified.

9. The combination with a screen-box, of` a diaphragm-frame located therein, a hinged screen-frame above the diaphragm-frame, and a dam-plate located against the inner face of one side of the boX, and provided with a securing-strip designed to retain the screenplate in place, substantially as specilied.

l0. The combination-with a screen-box, of a diaphragm-frame therein and of sufficiently less dimensions to leave a space around its edge, diaphragms mounted upon the diaphragm-frame, a screen-frame hinged at one edge and supported by the diaphragm-frame, a dam-plate located against the inner face of one side of the box and provided with a rail bearing upon the screen-frame, said screenbox being provided with a series of openings in its rear wall, and with a longitudinal opening at the bottom of its front wall, cover- ICO plates for said series of openings, and a screening-box designed to receive screenings discharged through the openingin the front wall, the side bars of the screen-frame being recessed to permit the discharge of the screenings from the diaphragms, substantially as specified.

In testimony whereof I affix my'signature in presence of two witnesses. t

CHARLES W. PICKETT.

Vitnesses:

Ross C. SCOTT, ALLYN R. SCOTT. 

